It's difficult to do. And yet, a new app called Mailbox has created so much demand, there's a 260,000-person long wait list to download the app.

Mailbox is an alternative email app that first made a stir in December. If you signed up back then for the app, the wait-list was still about 67,000 people long.

Email organizers are not a new idea. Many entrepreneurs have tried and failed to fix the inbox. So what makes Mailbox, which promises to put "email in its place", any different?

Mailbox is a free iPhone app that promises to help you reach inbox zero. It turns emails into a to-do list. For example, if you want to deal with a message later, you can swipe to remove it. The message will reappear the next day.

Our gadget team tried Mailbox and called it "one of the best productivity/email management apps we've ever come across."

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